Easily identifiable as an adult.

Overwinters as a larva for two years, the first one-and-a-half years in a small pistol-case, and in the second spring building a long straight case.

Recorded in 25 (9.3%) of the 270 2km squares of Huntingdonshire.

Last recorded in July 2020

Recorded date range (Adult): 26 May to 10 August

Recorded date range (Larva/Leafmine): 14 June to 10 October